. >>> she's a seattle college student who spent four years in an italian jail but could amanda knox go back to prison for her roommate's death? senior cnn international reporter ben wedeman has more on the case. >> reporter: an emotional amanda knox is led from an italian courtroom after learning she was free at last. the murder conviction against her and her former boyfriend overturned on appeal. that was october 2011. they had spent four years in prison for the 2007 sexual assault and murder of her roommate, british exchange student meredith kircher. it was a tabloid case that riveted the media, attracting an army of journalists to the medieval town of perugia where knox and kircher were studying italian language and culture. knox's tearful return to her family home in seattle, washington, seemed like the end of her ordeal, but it may not have been the end after all. the prosecution is demanding a retrial and will appeal the conviction before the italian supreme court in rome. the wheels of italian justice, however, grind slowly. if the acquittal is overturned, the case could go back